Method and device for attenuating water column reverberations using co-located hydrophones and geophones in ocean bottom seismic processing
First Claim
1. A process for attenuating noise is co-located hydrophone/geophone data, said process comprising:
- receiving a hydrophone signal at a hydrophone seismic sensor located at a hydrophone/geophone receiver location from a seismic signal source;
decomposing said hydrophone signal into a plurality of bandwidth-limited hydrophone signals;
receiving a geophone signal at a geophone seismic sensor located at the hydrophone/geophone receiver location from the seismic signal source;
decomposing said geophone signal into a plurality of bandwidth-limited geophone signals, the pass-bands of the bandwidth-limited geophone signals being substantially equal to the pass-bands of the bandwidth-limited hydrophone signals;
normalizing said hydrophone and geophone signals; and
combining the normalized signals;
wherein coherent noise is attenuated in the combined and normalized signals.
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Abstract
In ocean bottom seismic exploration, it is common for co-located hydrophones and geophones to be deployed on the ocean bottom. One problem encountered is the water column reverberation. An improved method and device is proposed for attenuating water column reverberations using co-located hydrophones and geophones in ocean bottom seismic processing. In this method, each recorded hydrophone and geophone signal, or trace, is decomposed into a series of narrow band-pass filtered traces. For each of the filtered traces, a measurement of the energy level is made upon which normalization factors are computed and applied. The resulting filtered, normalized traces are summed. Optionally, prior to application, the normalization factors can be organized by common shot, common group, common offset, and surface consistent normalization factors derived and applied for each pass-band.
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Citations
29 Claims
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1. A process for attenuating noise is co-located hydrophone/geophone data, said process comprising:
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receiving a hydrophone signal at a hydrophone seismic sensor located at a hydrophone/geophone receiver location from a seismic signal source; decomposing said hydrophone signal into a plurality of bandwidth-limited hydrophone signals; receiving a geophone signal at a geophone seismic sensor located at the hydrophone/geophone receiver location from the seismic signal source; decomposing said geophone signal into a plurality of bandwidth-limited geophone signals, the pass-bands of the bandwidth-limited geophone signals being substantially equal to the pass-bands of the bandwidth-limited hydrophone signals; normalizing said hydrophone and geophone signals; and combining the normalized signals; wherein coherent noise is attenuated in the combined and normalized signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 28, 29)
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13. A process for analyzing a set of seismic data received at a hydrophone/geophone receiver location, said process comprising:
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decomposing a hydrophone signal into a plurality of bandwidth-limited hydrophone signals by passing said hydrophone signal through a plurality of bandpass filters, said signal representing a recording of seismic signals received at a hydrophone located at a hydrophone/geophone receiver location; decomposing a geophone signal into a plurality of bandwidth-limited geophone signals by passing said geophone signal through the plurality of bandpass filters, said geophone signal representing a recording of seismic signals received at a geophone located at a hydrophone/geophone receiver location; measuring an energy level for each of said bandwidth-limited geophone and hydrophone signals; computing a normalization factor for each of said bandwidth-limited geophone and hydrophone signals based on the corresponding energy level; normalizing each bandwidth-limited geophone and hydrophone signal with its corresponding normalization factor; summing said normalized bandwidth-limited geophone and hydrophone signals; wherein coherent noise is attenuated in the combined and normalized signals.
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14. An apparatus for attenuating noise in co-located hydrophone/geophone data, said apparatus comprising:
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a seismic sensor signal decomposer which produces a plurality of geophone and hydrophone bandwidth-limited signals from a geophone signal and a hydrophone signal, wherein the geophone signal and the hydrophone signal represent a recording of data at a hydrophone/geophone receiver location; a normalizer of the geophone and hydrophone bandwidth-limited signals; and a normalized signal summer; wherein coherent noise is attenuated in the combined and normalized signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification